Cannot access Public Folder usings Exchange 2007 OWA Direct URL link

I have a mix 2003 and 2007 Exchange environment.
I cannot access the public folder using the direct url link, ie: http://bc-cas01/public.
It comes back with "page cannot be found"
bc-cas01 is the CAS and Hub Transport.
However, i can access the public folder using Outlook Client. I can also access it if I fully logs into OWA.
All Exchange 2007 are on SP1. I already rebooted all servers.
Thanks for your help

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